code: def test_interact(
      model: Chainer, payload: Dict[str, Optional[List]]
  ) -> List[str]:
      model_args = [arg or ["Test string."] for arg in payload.values()]
      try:
          _ = model(*model_args)
          return ["Test passed"]
      except Exception as e:
          raise HTTPException(status_code=400, detail=repr(e))
  
imports: import asyncio
  import os
  from collections import namedtuple
  from logging import getLogger
  from pathlib import Path
  from ssl import PROTOCOL_TLSv1_2
  from typing import Dict, List, Optional, Union
  import uvicorn
  from fastapi import Body, FastAPI, HTTPException
  from fastapi.utils import generate_operation_id_for_path
  from pydantic import BaseConfig, BaseModel
  from pydantic.fields import Field, ModelField
  from pydantic.main import ModelMetaclass
  from starlette.middleware.cors import CORSMiddleware
  from starlette.responses import RedirectResponse
  from deeppavlov.core.commands.infer import build_model
  from deeppavlov.core.commands.utils import parse_config
  from deeppavlov.core.common.chainer import Chainer
  from deeppavlov.core.common.file import read_json
  from deeppavlov.core.common.log import log_config
  from deeppavlov.core.common.paths import get_settings_path
  from deeppavlov.core.data.utils import check_nested_dict_keys, jsonify_data
  from deeppavlov.utils.connector import DialogLogger
  from deeppavlov.utils.server.metrics import metrics, PrometheusMiddleware
label_desc: Use image node_id 5 for calling a global function with example usage: test_interact(model, payload) and returns: list